feat: Add ReadMe and Licence

Author: gaelreyrol

LICENCE.md

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+# The MIT License (MIT)
+
+Copyright (c) Dans Ma Culotte <contact@dansmaculotte.fr>
+
+> Permission is hereby granted, free of charge, to any person obtaining a copy
+> of this software and associated documentation files (the "Software"), to deal
+> in the Software without restriction, including without limitation the rights
+> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+> copies of the Software, and to permit persons to whom the Software is
+> furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in
+> all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+> THE SOFTWARE.

ReadMe.md

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+# Monetico PHP SDK
+
+This library aims to facilitate the usage of Monetico Payment Service
+
+## Installation
+
+### Requirements
+
+- PHP 7.0
+
+You can install the package via composer:
+
+``` bash
+composer require dansmaculotte/monetico-php
+```
+
+## Usage
+
+```php
+use DansMaCulotte\Monetico\Monetico;
+
+$monetico = new Monetico(
+    'EPT_CODE',
+    'SECURITY_KEY',
+    'COMPANY_CODE',
+    'RETURN_URL',
+    'RETURN_SUCCESS_URL',
+    'RETURN_ERROR_URL'
+);
+```
+
+```php
+use DansMaCulotte\Monetico\Payment\Payment;
+
+$payment = new Payment(array(
+    'reference' => 'ABCDEF123',
+    'description' => 'Documentation',
+    'language' => 'FR',
+    'email' => 'john@snow.stark',
+    'amount' => 42,
+    'currency' => 'EUR',
+    'datetime' => Carbon::create(2019, 1, 1),
+));
+
+$url = $monetico->getPaymentUrl();
+$fields = $monetico->getPaymentFields($payment);
+```
+
+```php
+Use DansMaCulotte\Monetico\Payment\Response;
+use DansMaCulotte\Monetico\Payment\Receipt;
+
+// $data = json_decode($body, true);
+
+$response = new Response($data);
+
+$result = $monetico->validateSeal($response);
+
+$receipt = new Receipt($result);
+```
+
+## License
+
+The MIT License (MIT). Please see [License File](LICENSE.md) for more information.